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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * MIDI byte <-> sequencer event coder
4 *
5 * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>,
6 * Jaroslav Kysela <perex@perex.cz>
7 */
8
9#include <linux/slab.h>
10#include <linux/errno.h>
11#include <linux/string.h>
12#include <linux/module.h>
13#include <sound/core.h>
14#include <sound/seq_kernel.h>
15#include <sound/seq_midi_event.h>
16#include <sound/asoundef.h>
17
18MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>, Jaroslav Kysela <perex@perex.cz>");
19MODULE_DESCRIPTION("MIDI byte <-> sequencer event coder");
20MODULE_LICENSE("GPL");
21
22/* event type, index into status_event[] */
23/* from 0 to 6 are normal commands (note off, on, etc.) for 0x9?-0xe? */
24#define ST_INVALID 7
25#define ST_SPECIAL 8
26#define ST_SYSEX ST_SPECIAL
27/* from 8 to 15 are events for 0xf0-0xf7 */
28
29
30/*
31 * prototypes
32 */
33static void note_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
34static void one_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
35static void pitchbend_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
36static void two_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
37static void one_param_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
38static void songpos_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
39static void note_decode(struct snd_seq_event *ev, unsigned char *buf);
40static void one_param_decode(struct snd_seq_event *ev, unsigned char *buf);
41static void pitchbend_decode(struct snd_seq_event *ev, unsigned char *buf);
42static void two_param_decode(struct snd_seq_event *ev, unsigned char *buf);
43static void songpos_decode(struct snd_seq_event *ev, unsigned char *buf);
44
45/*
46 * event list
47 */
48static struct status_event_list {
49 int event;
50 int qlen;
51 void (*encode)(struct snd_midi_event *dev, struct snd_seq_event *ev);
52 void (*decode)(struct snd_seq_event *ev, unsigned char *buf);
53} status_event[] = {
54 /* 0x80 - 0xef */
55 {SNDRV_SEQ_EVENT_NOTEOFF, 2, note_event, note_decode},
56 {SNDRV_SEQ_EVENT_NOTEON, 2, note_event, note_decode},
57 {SNDRV_SEQ_EVENT_KEYPRESS, 2, note_event, note_decode},
58 {SNDRV_SEQ_EVENT_CONTROLLER, 2, two_param_ctrl_event, two_param_decode},
59 {SNDRV_SEQ_EVENT_PGMCHANGE, 1, one_param_ctrl_event, one_param_decode},
60 {SNDRV_SEQ_EVENT_CHANPRESS, 1, one_param_ctrl_event, one_param_decode},
61 {SNDRV_SEQ_EVENT_PITCHBEND, 2, pitchbend_ctrl_event, pitchbend_decode},
62 /* invalid */
63 {SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL},
64 /* 0xf0 - 0xff */
65 {SNDRV_SEQ_EVENT_SYSEX, 1, NULL, NULL}, /* sysex: 0xf0 */
66 {SNDRV_SEQ_EVENT_QFRAME, 1, one_param_event, one_param_decode}, /* 0xf1 */
67 {SNDRV_SEQ_EVENT_SONGPOS, 2, songpos_event, songpos_decode}, /* 0xf2 */
68 {SNDRV_SEQ_EVENT_SONGSEL, 1, one_param_event, one_param_decode}, /* 0xf3 */
69 {SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xf4 */
70 {SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xf5 */
71 {SNDRV_SEQ_EVENT_TUNE_REQUEST, 0, NULL, NULL}, /* 0xf6 */
72 {SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xf7 */
73 {SNDRV_SEQ_EVENT_CLOCK, 0, NULL, NULL}, /* 0xf8 */
74 {SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xf9 */
75 {SNDRV_SEQ_EVENT_START, 0, NULL, NULL}, /* 0xfa */
76 {SNDRV_SEQ_EVENT_CONTINUE, 0, NULL, NULL}, /* 0xfb */
77 {SNDRV_SEQ_EVENT_STOP, 0, NULL, NULL}, /* 0xfc */
78 {SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xfd */
79 {SNDRV_SEQ_EVENT_SENSING, 0, NULL, NULL}, /* 0xfe */
80 {SNDRV_SEQ_EVENT_RESET, 0, NULL, NULL}, /* 0xff */
81};
82
83static int extra_decode_ctrl14(struct snd_midi_event *dev, unsigned char *buf, int len,
84 struct snd_seq_event *ev);
85static int extra_decode_xrpn(struct snd_midi_event *dev, unsigned char *buf, int count,
86 struct snd_seq_event *ev);
87
88static struct extra_event_list {
89 int event;
90 int (*decode)(struct snd_midi_event *dev, unsigned char *buf, int len,
91 struct snd_seq_event *ev);
92} extra_event[] = {
93 {SNDRV_SEQ_EVENT_CONTROL14, extra_decode_ctrl14},
94 {SNDRV_SEQ_EVENT_NONREGPARAM, extra_decode_xrpn},
95 {SNDRV_SEQ_EVENT_REGPARAM, extra_decode_xrpn},
96};
97
98/*
99 * new/delete record
100 */
101
102int snd_midi_event_new(int bufsize, struct snd_midi_event **rdev)
103{
104 struct snd_midi_event *dev;
105
106 *rdev = NULL;
107 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
108 if (dev == NULL)
109 return -ENOMEM;
110 if (bufsize > 0) {
111 dev->buf = kmalloc(bufsize, GFP_KERNEL);
112 if (dev->buf == NULL) {
113 kfree(dev);
114 return -ENOMEM;
115 }
116 }
117 dev->bufsize = bufsize;
118 dev->lastcmd = 0xff;
119 dev->type = ST_INVALID;
120 spin_lock_init(&dev->lock);
121 *rdev = dev;
122 return 0;
123}
124EXPORT_SYMBOL(snd_midi_event_new);
125
126void snd_midi_event_free(struct snd_midi_event *dev)
127{
128 if (dev != NULL) {
129 kfree(dev->buf);
130 kfree(dev);
131 }
132}
133EXPORT_SYMBOL(snd_midi_event_free);
134
135/*
136 * initialize record
137 */
138static inline void reset_encode(struct snd_midi_event *dev)
139{
140 dev->read = 0;
141 dev->qlen = 0;
142 dev->type = ST_INVALID;
143}
144
145void snd_midi_event_reset_encode(struct snd_midi_event *dev)
146{
147 unsigned long flags;
148
149 spin_lock_irqsave(&dev->lock, flags);
150 reset_encode(dev);
151 spin_unlock_irqrestore(&dev->lock, flags);
152}
153EXPORT_SYMBOL(snd_midi_event_reset_encode);
154
155void snd_midi_event_reset_decode(struct snd_midi_event *dev)
156{
157 unsigned long flags;
158
159 spin_lock_irqsave(&dev->lock, flags);
160 dev->lastcmd = 0xff;
161 spin_unlock_irqrestore(&dev->lock, flags);
162}
163EXPORT_SYMBOL(snd_midi_event_reset_decode);
164
165void snd_midi_event_no_status(struct snd_midi_event *dev, int on)
166{
167 dev->nostat = on ? 1 : 0;
168}
169EXPORT_SYMBOL(snd_midi_event_no_status);
170
171/*
172 * read one byte and encode to sequencer event:
173 * return true if MIDI bytes are encoded to an event
174 * false data is not finished
175 */
176bool snd_midi_event_encode_byte(struct snd_midi_event *dev, unsigned char c,
177 struct snd_seq_event *ev)
178{
179 bool rc = false;
180 unsigned long flags;
181
182 if (c >= MIDI_CMD_COMMON_CLOCK) {
183 /* real-time event */
184 ev->type = status_event[ST_SPECIAL + c - 0xf0].event;
185 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
186 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_FIXED;
187 return ev->type != SNDRV_SEQ_EVENT_NONE;
188 }
189
190 spin_lock_irqsave(&dev->lock, flags);
191 if ((c & 0x80) &&
192 (c != MIDI_CMD_COMMON_SYSEX_END || dev->type != ST_SYSEX)) {
193 /* new command */
194 dev->buf[0] = c;
195 if ((c & 0xf0) == 0xf0) /* system messages */
196 dev->type = (c & 0x0f) + ST_SPECIAL;
197 else
198 dev->type = (c >> 4) & 0x07;
199 dev->read = 1;
200 dev->qlen = status_event[dev->type].qlen;
201 } else {
202 if (dev->qlen > 0) {
203 /* rest of command */
204 dev->buf[dev->read++] = c;
205 if (dev->type != ST_SYSEX)
206 dev->qlen--;
207 } else {
208 /* running status */
209 dev->buf[1] = c;
210 dev->qlen = status_event[dev->type].qlen - 1;
211 dev->read = 2;
212 }
213 }
214 if (dev->qlen == 0) {
215 ev->type = status_event[dev->type].event;
216 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
217 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_FIXED;
218 if (status_event[dev->type].encode) /* set data values */
219 status_event[dev->type].encode(dev, ev);
220 if (dev->type >= ST_SPECIAL)
221 dev->type = ST_INVALID;
222 rc = true;
223 } else if (dev->type == ST_SYSEX) {
224 if (c == MIDI_CMD_COMMON_SYSEX_END ||
225 dev->read >= dev->bufsize) {
226 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
227 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_VARIABLE;
228 ev->type = SNDRV_SEQ_EVENT_SYSEX;
229 ev->data.ext.len = dev->read;
230 ev->data.ext.ptr = dev->buf;
231 if (c != MIDI_CMD_COMMON_SYSEX_END)
232 dev->read = 0; /* continue to parse */
233 else
234 reset_encode(dev); /* all parsed */
235 rc = true;
236 }
237 }
238
239 spin_unlock_irqrestore(&dev->lock, flags);
240 return rc;
241}
242EXPORT_SYMBOL(snd_midi_event_encode_byte);
243
244/* encode note event */
245static void note_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
246{
247 ev->data.note.channel = dev->buf[0] & 0x0f;
248 ev->data.note.note = dev->buf[1];
249 ev->data.note.velocity = dev->buf[2];
250}
251
252/* encode one parameter controls */
253static void one_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
254{
255 ev->data.control.channel = dev->buf[0] & 0x0f;
256 ev->data.control.value = dev->buf[1];
257}
258
259/* encode pitch wheel change */
260static void pitchbend_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
261{
262 ev->data.control.channel = dev->buf[0] & 0x0f;
263 ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1] - 8192;
264}
265
266/* encode midi control change */
267static void two_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
268{
269 ev->data.control.channel = dev->buf[0] & 0x0f;
270 ev->data.control.param = dev->buf[1];
271 ev->data.control.value = dev->buf[2];
272}
273
274/* encode one parameter value*/
275static void one_param_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
276{
277 ev->data.control.value = dev->buf[1];
278}
279
280/* encode song position */
281static void songpos_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
282{
283 ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1];
284}
285
286/*
287 * decode from a sequencer event to midi bytes
288 * return the size of decoded midi events
289 */
290long snd_midi_event_decode(struct snd_midi_event *dev, unsigned char *buf, long count,
291 struct snd_seq_event *ev)
292{
293 unsigned int cmd, type;
294
295 if (ev->type == SNDRV_SEQ_EVENT_NONE)
296 return -ENOENT;
297
298 for (type = 0; type < ARRAY_SIZE(status_event); type++) {
299 if (ev->type == status_event[type].event)
300 goto __found;
301 }
302 for (type = 0; type < ARRAY_SIZE(extra_event); type++) {
303 if (ev->type == extra_event[type].event)
304 return extra_event[type].decode(dev, buf, count, ev);
305 }
306 return -ENOENT;
307
308 __found:
309 if (type >= ST_SPECIAL)
310 cmd = 0xf0 + (type - ST_SPECIAL);
311 else
312 /* data.note.channel and data.control.channel is identical */
313 cmd = 0x80 | (type << 4) | (ev->data.note.channel & 0x0f);
314
315
316 if (cmd == MIDI_CMD_COMMON_SYSEX) {
317 snd_midi_event_reset_decode(dev);
318 return snd_seq_expand_var_event(ev, count, buf, 1, 0);
319 } else {
320 int qlen;
321 unsigned char xbuf[4];
322 unsigned long flags;
323
324 spin_lock_irqsave(&dev->lock, flags);
325 if ((cmd & 0xf0) == 0xf0 || dev->lastcmd != cmd || dev->nostat) {
326 dev->lastcmd = cmd;
327 spin_unlock_irqrestore(&dev->lock, flags);
328 xbuf[0] = cmd;
329 if (status_event[type].decode)
330 status_event[type].decode(ev, xbuf + 1);
331 qlen = status_event[type].qlen + 1;
332 } else {
333 spin_unlock_irqrestore(&dev->lock, flags);
334 if (status_event[type].decode)
335 status_event[type].decode(ev, xbuf + 0);
336 qlen = status_event[type].qlen;
337 }
338 if (count < qlen)
339 return -ENOMEM;
340 memcpy(buf, xbuf, qlen);
341 return qlen;
342 }
343}
344EXPORT_SYMBOL(snd_midi_event_decode);
345
346
347/* decode note event */
348static void note_decode(struct snd_seq_event *ev, unsigned char *buf)
349{
350 buf[0] = ev->data.note.note & 0x7f;
351 buf[1] = ev->data.note.velocity & 0x7f;
352}
353
354/* decode one parameter controls */
355static void one_param_decode(struct snd_seq_event *ev, unsigned char *buf)
356{
357 buf[0] = ev->data.control.value & 0x7f;
358}
359
360/* decode pitch wheel change */
361static void pitchbend_decode(struct snd_seq_event *ev, unsigned char *buf)
362{
363 int value = ev->data.control.value + 8192;
364 buf[0] = value & 0x7f;
365 buf[1] = (value >> 7) & 0x7f;
366}
367
368/* decode midi control change */
369static void two_param_decode(struct snd_seq_event *ev, unsigned char *buf)
370{
371 buf[0] = ev->data.control.param & 0x7f;
372 buf[1] = ev->data.control.value & 0x7f;
373}
374
375/* decode song position */
376static void songpos_decode(struct snd_seq_event *ev, unsigned char *buf)
377{
378 buf[0] = ev->data.control.value & 0x7f;
379 buf[1] = (ev->data.control.value >> 7) & 0x7f;
380}
381
382/* decode 14bit control */
383static int extra_decode_ctrl14(struct snd_midi_event *dev, unsigned char *buf,
384 int count, struct snd_seq_event *ev)
385{
386 unsigned char cmd;
387 int idx = 0;
388
389 cmd = MIDI_CMD_CONTROL|(ev->data.control.channel & 0x0f);
390 if (ev->data.control.param < 0x20) {
391 if (count < 4)
392 return -ENOMEM;
393 if (dev->nostat && count < 6)
394 return -ENOMEM;
395 if (cmd != dev->lastcmd || dev->nostat) {
396 if (count < 5)
397 return -ENOMEM;
398 buf[idx++] = dev->lastcmd = cmd;
399 }
400 buf[idx++] = ev->data.control.param;
401 buf[idx++] = (ev->data.control.value >> 7) & 0x7f;
402 if (dev->nostat)
403 buf[idx++] = cmd;
404 buf[idx++] = ev->data.control.param + 0x20;
405 buf[idx++] = ev->data.control.value & 0x7f;
406 } else {
407 if (count < 2)
408 return -ENOMEM;
409 if (cmd != dev->lastcmd || dev->nostat) {
410 if (count < 3)
411 return -ENOMEM;
412 buf[idx++] = dev->lastcmd = cmd;
413 }
414 buf[idx++] = ev->data.control.param & 0x7f;
415 buf[idx++] = ev->data.control.value & 0x7f;
416 }
417 return idx;
418}
419
420/* decode reg/nonreg param */
421static int extra_decode_xrpn(struct snd_midi_event *dev, unsigned char *buf,
422 int count, struct snd_seq_event *ev)
423{
424 unsigned char cmd;
425 char *cbytes;
426 static char cbytes_nrpn[4] = { MIDI_CTL_NONREG_PARM_NUM_MSB,
427 MIDI_CTL_NONREG_PARM_NUM_LSB,
428 MIDI_CTL_MSB_DATA_ENTRY,
429 MIDI_CTL_LSB_DATA_ENTRY };
430 static char cbytes_rpn[4] = { MIDI_CTL_REGIST_PARM_NUM_MSB,
431 MIDI_CTL_REGIST_PARM_NUM_LSB,
432 MIDI_CTL_MSB_DATA_ENTRY,
433 MIDI_CTL_LSB_DATA_ENTRY };
434 unsigned char bytes[4];
435 int idx = 0, i;
436
437 if (count < 8)
438 return -ENOMEM;
439 if (dev->nostat && count < 12)
440 return -ENOMEM;
441 cmd = MIDI_CMD_CONTROL|(ev->data.control.channel & 0x0f);
442 bytes[0] = (ev->data.control.param & 0x3f80) >> 7;
443 bytes[1] = ev->data.control.param & 0x007f;
444 bytes[2] = (ev->data.control.value & 0x3f80) >> 7;
445 bytes[3] = ev->data.control.value & 0x007f;
446 if (cmd != dev->lastcmd && !dev->nostat) {
447 if (count < 9)
448 return -ENOMEM;
449 buf[idx++] = dev->lastcmd = cmd;
450 }
451 cbytes = ev->type == SNDRV_SEQ_EVENT_NONREGPARAM ? cbytes_nrpn : cbytes_rpn;
452 for (i = 0; i < 4; i++) {
453 if (dev->nostat)
454 buf[idx++] = dev->lastcmd = cmd;
455 buf[idx++] = cbytes[i];
456 buf[idx++] = bytes[i];
457 }
458 return idx;
459}
1/*
2 * MIDI byte <-> sequencer event coder
3 *
4 * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>,
5 * Jaroslav Kysela <perex@perex.cz>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22#include <linux/slab.h>
23#include <linux/errno.h>
24#include <linux/string.h>
25#include <linux/module.h>
26#include <sound/core.h>
27#include <sound/seq_kernel.h>
28#include <sound/seq_midi_event.h>
29#include <sound/asoundef.h>
30
31MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>, Jaroslav Kysela <perex@perex.cz>");
32MODULE_DESCRIPTION("MIDI byte <-> sequencer event coder");
33MODULE_LICENSE("GPL");
34
35/* event type, index into status_event[] */
36/* from 0 to 6 are normal commands (note off, on, etc.) for 0x9?-0xe? */
37#define ST_INVALID 7
38#define ST_SPECIAL 8
39#define ST_SYSEX ST_SPECIAL
40/* from 8 to 15 are events for 0xf0-0xf7 */
41
42
43/*
44 * prototypes
45 */
46static void note_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
47static void one_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
48static void pitchbend_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
49static void two_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
50static void one_param_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
51static void songpos_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
52static void note_decode(struct snd_seq_event *ev, unsigned char *buf);
53static void one_param_decode(struct snd_seq_event *ev, unsigned char *buf);
54static void pitchbend_decode(struct snd_seq_event *ev, unsigned char *buf);
55static void two_param_decode(struct snd_seq_event *ev, unsigned char *buf);
56static void songpos_decode(struct snd_seq_event *ev, unsigned char *buf);
57
58/*
59 * event list
60 */
61static struct status_event_list {
62 int event;
63 int qlen;
64 void (*encode)(struct snd_midi_event *dev, struct snd_seq_event *ev);
65 void (*decode)(struct snd_seq_event *ev, unsigned char *buf);
66} status_event[] = {
67 /* 0x80 - 0xef */
68 {SNDRV_SEQ_EVENT_NOTEOFF, 2, note_event, note_decode},
69 {SNDRV_SEQ_EVENT_NOTEON, 2, note_event, note_decode},
70 {SNDRV_SEQ_EVENT_KEYPRESS, 2, note_event, note_decode},
71 {SNDRV_SEQ_EVENT_CONTROLLER, 2, two_param_ctrl_event, two_param_decode},
72 {SNDRV_SEQ_EVENT_PGMCHANGE, 1, one_param_ctrl_event, one_param_decode},
73 {SNDRV_SEQ_EVENT_CHANPRESS, 1, one_param_ctrl_event, one_param_decode},
74 {SNDRV_SEQ_EVENT_PITCHBEND, 2, pitchbend_ctrl_event, pitchbend_decode},
75 /* invalid */
76 {SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL},
77 /* 0xf0 - 0xff */
78 {SNDRV_SEQ_EVENT_SYSEX, 1, NULL, NULL}, /* sysex: 0xf0 */
79 {SNDRV_SEQ_EVENT_QFRAME, 1, one_param_event, one_param_decode}, /* 0xf1 */
80 {SNDRV_SEQ_EVENT_SONGPOS, 2, songpos_event, songpos_decode}, /* 0xf2 */
81 {SNDRV_SEQ_EVENT_SONGSEL, 1, one_param_event, one_param_decode}, /* 0xf3 */
82 {SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xf4 */
83 {SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xf5 */
84 {SNDRV_SEQ_EVENT_TUNE_REQUEST, 0, NULL, NULL}, /* 0xf6 */
85 {SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xf7 */
86 {SNDRV_SEQ_EVENT_CLOCK, 0, NULL, NULL}, /* 0xf8 */
87 {SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xf9 */
88 {SNDRV_SEQ_EVENT_START, 0, NULL, NULL}, /* 0xfa */
89 {SNDRV_SEQ_EVENT_CONTINUE, 0, NULL, NULL}, /* 0xfb */
90 {SNDRV_SEQ_EVENT_STOP, 0, NULL, NULL}, /* 0xfc */
91 {SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xfd */
92 {SNDRV_SEQ_EVENT_SENSING, 0, NULL, NULL}, /* 0xfe */
93 {SNDRV_SEQ_EVENT_RESET, 0, NULL, NULL}, /* 0xff */
94};
95
96static int extra_decode_ctrl14(struct snd_midi_event *dev, unsigned char *buf, int len,
97 struct snd_seq_event *ev);
98static int extra_decode_xrpn(struct snd_midi_event *dev, unsigned char *buf, int count,
99 struct snd_seq_event *ev);
100
101static struct extra_event_list {
102 int event;
103 int (*decode)(struct snd_midi_event *dev, unsigned char *buf, int len,
104 struct snd_seq_event *ev);
105} extra_event[] = {
106 {SNDRV_SEQ_EVENT_CONTROL14, extra_decode_ctrl14},
107 {SNDRV_SEQ_EVENT_NONREGPARAM, extra_decode_xrpn},
108 {SNDRV_SEQ_EVENT_REGPARAM, extra_decode_xrpn},
109};
110
111/*
112 * new/delete record
113 */
114
115int snd_midi_event_new(int bufsize, struct snd_midi_event **rdev)
116{
117 struct snd_midi_event *dev;
118
119 *rdev = NULL;
120 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
121 if (dev == NULL)
122 return -ENOMEM;
123 if (bufsize > 0) {
124 dev->buf = kmalloc(bufsize, GFP_KERNEL);
125 if (dev->buf == NULL) {
126 kfree(dev);
127 return -ENOMEM;
128 }
129 }
130 dev->bufsize = bufsize;
131 dev->lastcmd = 0xff;
132 dev->type = ST_INVALID;
133 spin_lock_init(&dev->lock);
134 *rdev = dev;
135 return 0;
136}
137
138void snd_midi_event_free(struct snd_midi_event *dev)
139{
140 if (dev != NULL) {
141 kfree(dev->buf);
142 kfree(dev);
143 }
144}
145
146/*
147 * initialize record
148 */
149static inline void reset_encode(struct snd_midi_event *dev)
150{
151 dev->read = 0;
152 dev->qlen = 0;
153 dev->type = ST_INVALID;
154}
155
156void snd_midi_event_reset_encode(struct snd_midi_event *dev)
157{
158 unsigned long flags;
159
160 spin_lock_irqsave(&dev->lock, flags);
161 reset_encode(dev);
162 spin_unlock_irqrestore(&dev->lock, flags);
163}
164
165void snd_midi_event_reset_decode(struct snd_midi_event *dev)
166{
167 unsigned long flags;
168
169 spin_lock_irqsave(&dev->lock, flags);
170 dev->lastcmd = 0xff;
171 spin_unlock_irqrestore(&dev->lock, flags);
172}
173
174#if 0
175void snd_midi_event_init(struct snd_midi_event *dev)
176{
177 snd_midi_event_reset_encode(dev);
178 snd_midi_event_reset_decode(dev);
179}
180#endif /* 0 */
181
182void snd_midi_event_no_status(struct snd_midi_event *dev, int on)
183{
184 dev->nostat = on ? 1 : 0;
185}
186
187/*
188 * resize buffer
189 */
190#if 0
191int snd_midi_event_resize_buffer(struct snd_midi_event *dev, int bufsize)
192{
193 unsigned char *new_buf, *old_buf;
194 unsigned long flags;
195
196 if (bufsize == dev->bufsize)
197 return 0;
198 new_buf = kmalloc(bufsize, GFP_KERNEL);
199 if (new_buf == NULL)
200 return -ENOMEM;
201 spin_lock_irqsave(&dev->lock, flags);
202 old_buf = dev->buf;
203 dev->buf = new_buf;
204 dev->bufsize = bufsize;
205 reset_encode(dev);
206 spin_unlock_irqrestore(&dev->lock, flags);
207 kfree(old_buf);
208 return 0;
209}
210#endif /* 0 */
211
212/*
213 * read bytes and encode to sequencer event if finished
214 * return the size of encoded bytes
215 */
216long snd_midi_event_encode(struct snd_midi_event *dev, unsigned char *buf, long count,
217 struct snd_seq_event *ev)
218{
219 long result = 0;
220 int rc;
221
222 ev->type = SNDRV_SEQ_EVENT_NONE;
223
224 while (count-- > 0) {
225 rc = snd_midi_event_encode_byte(dev, *buf++, ev);
226 result++;
227 if (rc < 0)
228 return rc;
229 else if (rc > 0)
230 return result;
231 }
232
233 return result;
234}
235
236/*
237 * read one byte and encode to sequencer event:
238 * return 1 if MIDI bytes are encoded to an event
239 * 0 data is not finished
240 * negative for error
241 */
242int snd_midi_event_encode_byte(struct snd_midi_event *dev, int c,
243 struct snd_seq_event *ev)
244{
245 int rc = 0;
246 unsigned long flags;
247
248 c &= 0xff;
249
250 if (c >= MIDI_CMD_COMMON_CLOCK) {
251 /* real-time event */
252 ev->type = status_event[ST_SPECIAL + c - 0xf0].event;
253 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
254 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_FIXED;
255 return ev->type != SNDRV_SEQ_EVENT_NONE;
256 }
257
258 spin_lock_irqsave(&dev->lock, flags);
259 if ((c & 0x80) &&
260 (c != MIDI_CMD_COMMON_SYSEX_END || dev->type != ST_SYSEX)) {
261 /* new command */
262 dev->buf[0] = c;
263 if ((c & 0xf0) == 0xf0) /* system messages */
264 dev->type = (c & 0x0f) + ST_SPECIAL;
265 else
266 dev->type = (c >> 4) & 0x07;
267 dev->read = 1;
268 dev->qlen = status_event[dev->type].qlen;
269 } else {
270 if (dev->qlen > 0) {
271 /* rest of command */
272 dev->buf[dev->read++] = c;
273 if (dev->type != ST_SYSEX)
274 dev->qlen--;
275 } else {
276 /* running status */
277 dev->buf[1] = c;
278 dev->qlen = status_event[dev->type].qlen - 1;
279 dev->read = 2;
280 }
281 }
282 if (dev->qlen == 0) {
283 ev->type = status_event[dev->type].event;
284 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
285 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_FIXED;
286 if (status_event[dev->type].encode) /* set data values */
287 status_event[dev->type].encode(dev, ev);
288 if (dev->type >= ST_SPECIAL)
289 dev->type = ST_INVALID;
290 rc = 1;
291 } else if (dev->type == ST_SYSEX) {
292 if (c == MIDI_CMD_COMMON_SYSEX_END ||
293 dev->read >= dev->bufsize) {
294 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
295 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_VARIABLE;
296 ev->type = SNDRV_SEQ_EVENT_SYSEX;
297 ev->data.ext.len = dev->read;
298 ev->data.ext.ptr = dev->buf;
299 if (c != MIDI_CMD_COMMON_SYSEX_END)
300 dev->read = 0; /* continue to parse */
301 else
302 reset_encode(dev); /* all parsed */
303 rc = 1;
304 }
305 }
306
307 spin_unlock_irqrestore(&dev->lock, flags);
308 return rc;
309}
310
311/* encode note event */
312static void note_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
313{
314 ev->data.note.channel = dev->buf[0] & 0x0f;
315 ev->data.note.note = dev->buf[1];
316 ev->data.note.velocity = dev->buf[2];
317}
318
319/* encode one parameter controls */
320static void one_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
321{
322 ev->data.control.channel = dev->buf[0] & 0x0f;
323 ev->data.control.value = dev->buf[1];
324}
325
326/* encode pitch wheel change */
327static void pitchbend_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
328{
329 ev->data.control.channel = dev->buf[0] & 0x0f;
330 ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1] - 8192;
331}
332
333/* encode midi control change */
334static void two_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
335{
336 ev->data.control.channel = dev->buf[0] & 0x0f;
337 ev->data.control.param = dev->buf[1];
338 ev->data.control.value = dev->buf[2];
339}
340
341/* encode one parameter value*/
342static void one_param_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
343{
344 ev->data.control.value = dev->buf[1];
345}
346
347/* encode song position */
348static void songpos_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
349{
350 ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1];
351}
352
353/*
354 * decode from a sequencer event to midi bytes
355 * return the size of decoded midi events
356 */
357long snd_midi_event_decode(struct snd_midi_event *dev, unsigned char *buf, long count,
358 struct snd_seq_event *ev)
359{
360 unsigned int cmd, type;
361
362 if (ev->type == SNDRV_SEQ_EVENT_NONE)
363 return -ENOENT;
364
365 for (type = 0; type < ARRAY_SIZE(status_event); type++) {
366 if (ev->type == status_event[type].event)
367 goto __found;
368 }
369 for (type = 0; type < ARRAY_SIZE(extra_event); type++) {
370 if (ev->type == extra_event[type].event)
371 return extra_event[type].decode(dev, buf, count, ev);
372 }
373 return -ENOENT;
374
375 __found:
376 if (type >= ST_SPECIAL)
377 cmd = 0xf0 + (type - ST_SPECIAL);
378 else
379 /* data.note.channel and data.control.channel is identical */
380 cmd = 0x80 | (type << 4) | (ev->data.note.channel & 0x0f);
381
382
383 if (cmd == MIDI_CMD_COMMON_SYSEX) {
384 snd_midi_event_reset_decode(dev);
385 return snd_seq_expand_var_event(ev, count, buf, 1, 0);
386 } else {
387 int qlen;
388 unsigned char xbuf[4];
389 unsigned long flags;
390
391 spin_lock_irqsave(&dev->lock, flags);
392 if ((cmd & 0xf0) == 0xf0 || dev->lastcmd != cmd || dev->nostat) {
393 dev->lastcmd = cmd;
394 spin_unlock_irqrestore(&dev->lock, flags);
395 xbuf[0] = cmd;
396 if (status_event[type].decode)
397 status_event[type].decode(ev, xbuf + 1);
398 qlen = status_event[type].qlen + 1;
399 } else {
400 spin_unlock_irqrestore(&dev->lock, flags);
401 if (status_event[type].decode)
402 status_event[type].decode(ev, xbuf + 0);
403 qlen = status_event[type].qlen;
404 }
405 if (count < qlen)
406 return -ENOMEM;
407 memcpy(buf, xbuf, qlen);
408 return qlen;
409 }
410}
411
412
413/* decode note event */
414static void note_decode(struct snd_seq_event *ev, unsigned char *buf)
415{
416 buf[0] = ev->data.note.note & 0x7f;
417 buf[1] = ev->data.note.velocity & 0x7f;
418}
419
420/* decode one parameter controls */
421static void one_param_decode(struct snd_seq_event *ev, unsigned char *buf)
422{
423 buf[0] = ev->data.control.value & 0x7f;
424}
425
426/* decode pitch wheel change */
427static void pitchbend_decode(struct snd_seq_event *ev, unsigned char *buf)
428{
429 int value = ev->data.control.value + 8192;
430 buf[0] = value & 0x7f;
431 buf[1] = (value >> 7) & 0x7f;
432}
433
434/* decode midi control change */
435static void two_param_decode(struct snd_seq_event *ev, unsigned char *buf)
436{
437 buf[0] = ev->data.control.param & 0x7f;
438 buf[1] = ev->data.control.value & 0x7f;
439}
440
441/* decode song position */
442static void songpos_decode(struct snd_seq_event *ev, unsigned char *buf)
443{
444 buf[0] = ev->data.control.value & 0x7f;
445 buf[1] = (ev->data.control.value >> 7) & 0x7f;
446}
447
448/* decode 14bit control */
449static int extra_decode_ctrl14(struct snd_midi_event *dev, unsigned char *buf,
450 int count, struct snd_seq_event *ev)
451{
452 unsigned char cmd;
453 int idx = 0;
454
455 cmd = MIDI_CMD_CONTROL|(ev->data.control.channel & 0x0f);
456 if (ev->data.control.param < 0x20) {
457 if (count < 4)
458 return -ENOMEM;
459 if (dev->nostat && count < 6)
460 return -ENOMEM;
461 if (cmd != dev->lastcmd || dev->nostat) {
462 if (count < 5)
463 return -ENOMEM;
464 buf[idx++] = dev->lastcmd = cmd;
465 }
466 buf[idx++] = ev->data.control.param;
467 buf[idx++] = (ev->data.control.value >> 7) & 0x7f;
468 if (dev->nostat)
469 buf[idx++] = cmd;
470 buf[idx++] = ev->data.control.param + 0x20;
471 buf[idx++] = ev->data.control.value & 0x7f;
472 } else {
473 if (count < 2)
474 return -ENOMEM;
475 if (cmd != dev->lastcmd || dev->nostat) {
476 if (count < 3)
477 return -ENOMEM;
478 buf[idx++] = dev->lastcmd = cmd;
479 }
480 buf[idx++] = ev->data.control.param & 0x7f;
481 buf[idx++] = ev->data.control.value & 0x7f;
482 }
483 return idx;
484}
485
486/* decode reg/nonreg param */
487static int extra_decode_xrpn(struct snd_midi_event *dev, unsigned char *buf,
488 int count, struct snd_seq_event *ev)
489{
490 unsigned char cmd;
491 char *cbytes;
492 static char cbytes_nrpn[4] = { MIDI_CTL_NONREG_PARM_NUM_MSB,
493 MIDI_CTL_NONREG_PARM_NUM_LSB,
494 MIDI_CTL_MSB_DATA_ENTRY,
495 MIDI_CTL_LSB_DATA_ENTRY };
496 static char cbytes_rpn[4] = { MIDI_CTL_REGIST_PARM_NUM_MSB,
497 MIDI_CTL_REGIST_PARM_NUM_LSB,
498 MIDI_CTL_MSB_DATA_ENTRY,
499 MIDI_CTL_LSB_DATA_ENTRY };
500 unsigned char bytes[4];
501 int idx = 0, i;
502
503 if (count < 8)
504 return -ENOMEM;
505 if (dev->nostat && count < 12)
506 return -ENOMEM;
507 cmd = MIDI_CMD_CONTROL|(ev->data.control.channel & 0x0f);
508 bytes[0] = (ev->data.control.param & 0x3f80) >> 7;
509 bytes[1] = ev->data.control.param & 0x007f;
510 bytes[2] = (ev->data.control.value & 0x3f80) >> 7;
511 bytes[3] = ev->data.control.value & 0x007f;
512 if (cmd != dev->lastcmd && !dev->nostat) {
513 if (count < 9)
514 return -ENOMEM;
515 buf[idx++] = dev->lastcmd = cmd;
516 }
517 cbytes = ev->type == SNDRV_SEQ_EVENT_NONREGPARAM ? cbytes_nrpn : cbytes_rpn;
518 for (i = 0; i < 4; i++) {
519 if (dev->nostat)
520 buf[idx++] = dev->lastcmd = cmd;
521 buf[idx++] = cbytes[i];
522 buf[idx++] = bytes[i];
523 }
524 return idx;
525}
526
527/*
528 * exports
529 */
530
531EXPORT_SYMBOL(snd_midi_event_new);
532EXPORT_SYMBOL(snd_midi_event_free);
533EXPORT_SYMBOL(snd_midi_event_reset_encode);
534EXPORT_SYMBOL(snd_midi_event_reset_decode);
535EXPORT_SYMBOL(snd_midi_event_no_status);
536EXPORT_SYMBOL(snd_midi_event_encode);
537EXPORT_SYMBOL(snd_midi_event_encode_byte);
538EXPORT_SYMBOL(snd_midi_event_decode);
539
540static int __init alsa_seq_midi_event_init(void)
541{
542 return 0;
543}
544
545static void __exit alsa_seq_midi_event_exit(void)
546{
547}
548
549module_init(alsa_seq_midi_event_init)
550module_exit(alsa_seq_midi_event_exit)